| /* |
| * Copyright 2020 Google LLC |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.google.auto.value.extension.serializable.serializer.impl; |
| |
| import com.google.auto.common.MoreTypes; |
| import com.google.auto.service.AutoService; |
| import com.google.auto.value.extension.serializable.serializer.interfaces.Serializer; |
| import com.google.auto.value.extension.serializable.serializer.interfaces.SerializerExtension; |
| import com.google.auto.value.extension.serializable.serializer.interfaces.SerializerFactory; |
| import com.google.auto.value.extension.serializable.serializer.runtime.FunctionWithExceptions; |
| import com.google.common.collect.ImmutableMap; |
| import com.squareup.javapoet.CodeBlock; |
| import java.util.Optional; |
| import java.util.function.Function; |
| import javax.annotation.processing.ProcessingEnvironment; |
| import javax.lang.model.element.TypeElement; |
| import javax.lang.model.type.TypeKind; |
| import javax.lang.model.type.TypeMirror; |
| |
| /** |
| * A {@link SerializerExtension} that deserializes objects inside an {@link ImmutableMap}. |
| * |
| * <p>Enables unserializable objects inside an ImmutableMap to be serializable. |
| */ |
| @AutoService(SerializerExtension.class) |
| public final class ImmutableMapSerializerExtension implements SerializerExtension { |
| |
| public ImmutableMapSerializerExtension() {} |
| |
| @Override |
| public Optional<Serializer> getSerializer( |
| TypeMirror typeMirror, SerializerFactory factory, ProcessingEnvironment processingEnv) { |
| if (!isImmutableMap(typeMirror)) { |
| return Optional.empty(); |
| } |
| |
| // Extract the K, V of ImmutableMap<K, V>. |
| TypeMirror keyType = getKeyType(typeMirror); |
| TypeMirror valueType = getValueType(typeMirror); |
| Serializer keyTypeSerializer = factory.getSerializer(keyType); |
| Serializer valueTypeSerializer = factory.getSerializer(valueType); |
| |
| // We don't need this serializer if the K and V of ImmutableMap<K, V> are serializable. |
| if (keyTypeSerializer.isIdentity() && valueTypeSerializer.isIdentity()) { |
| return Optional.empty(); |
| } |
| |
| return Optional.of( |
| new ImmutableMapSerializer( |
| keyType, valueType, keyTypeSerializer, valueTypeSerializer, factory, processingEnv)); |
| } |
| |
| private static class ImmutableMapSerializer implements Serializer { |
| |
| private final TypeMirror keyType; |
| private final TypeMirror valueType; |
| private final TypeMirror keyProxyType; |
| private final TypeMirror valueProxyType; |
| private final Serializer keyTypeSerializer; |
| private final Serializer valueTypeSerializer; |
| private final SerializerFactory factory; |
| private final ProcessingEnvironment processingEnv; |
| |
| ImmutableMapSerializer( |
| TypeMirror keyType, |
| TypeMirror valueType, |
| Serializer keyTypeSerializer, |
| Serializer valueTypeSerializer, |
| SerializerFactory factory, |
| ProcessingEnvironment processingEnv) { |
| this.keyType = keyType; |
| this.valueType = valueType; |
| this.keyProxyType = keyTypeSerializer.proxyFieldType(); |
| this.valueProxyType = valueTypeSerializer.proxyFieldType(); |
| this.keyTypeSerializer = keyTypeSerializer; |
| this.valueTypeSerializer = valueTypeSerializer; |
| this.factory = factory; |
| this.processingEnv = processingEnv; |
| } |
| |
| @Override |
| public TypeMirror proxyFieldType() { |
| TypeElement immutableMapTypeElement = |
| processingEnv.getElementUtils().getTypeElement(ImmutableMap.class.getCanonicalName()); |
| return processingEnv |
| .getTypeUtils() |
| .getDeclaredType(immutableMapTypeElement, keyProxyType, valueProxyType); |
| } |
| |
| @Override |
| public CodeBlock toProxy(CodeBlock expression) { |
| return CodeBlock.of( |
| "$L.entrySet().stream().collect($T.toImmutableMap($L, $L))", |
| expression, |
| ImmutableMap.class, |
| generateKeyMapFunction(keyType, keyProxyType, keyTypeSerializer::toProxy), |
| generateValueMapFunction(valueType, valueProxyType, valueTypeSerializer::toProxy)); |
| } |
| |
| @Override |
| public CodeBlock fromProxy(CodeBlock expression) { |
| return CodeBlock.of( |
| "$L.entrySet().stream().collect($T.toImmutableMap($L, $L))", |
| expression, |
| ImmutableMap.class, |
| generateKeyMapFunction(keyProxyType, keyType, keyTypeSerializer::fromProxy), |
| generateValueMapFunction(valueProxyType, valueType, valueTypeSerializer::fromProxy)); |
| } |
| |
| private CodeBlock generateKeyMapFunction( |
| TypeMirror originalType, |
| TypeMirror transformedType, |
| Function<CodeBlock, CodeBlock> proxyMap) { |
| CodeBlock element = factory.newIdentifier("element"); |
| CodeBlock value = factory.newIdentifier("value"); |
| return CodeBlock.of( |
| "$1L -> $2T.<$3T, $4T>wrapper($5L -> $6L).apply($1L.getKey())", |
| value, |
| FunctionWithExceptions.class, |
| originalType, |
| transformedType, |
| element, |
| proxyMap.apply(element)); |
| } |
| |
| private CodeBlock generateValueMapFunction( |
| TypeMirror originalType, |
| TypeMirror transformedType, |
| Function<CodeBlock, CodeBlock> proxyMap) { |
| CodeBlock element = factory.newIdentifier("element"); |
| CodeBlock value = factory.newIdentifier("value"); |
| return CodeBlock.of( |
| "$1L -> $2T.<$3T, $4T>wrapper($5L -> $6L).apply($1L.getValue())", |
| value, |
| FunctionWithExceptions.class, |
| originalType, |
| transformedType, |
| element, |
| proxyMap.apply(element)); |
| } |
| } |
| |
| private static boolean isImmutableMap(TypeMirror type) { |
| if (type.getKind() != TypeKind.DECLARED) { |
| return false; |
| } |
| |
| return MoreTypes.asTypeElement(type) |
| .getQualifiedName() |
| .contentEquals("com.google.common.collect.ImmutableMap"); |
| } |
| |
| private static TypeMirror getKeyType(TypeMirror type) { |
| return MoreTypes.asDeclared(type).getTypeArguments().get(0); |
| } |
| |
| private static TypeMirror getValueType(TypeMirror type) { |
| return MoreTypes.asDeclared(type).getTypeArguments().get(1); |
| } |
| } |